Step-by-step explanation:
Ideal Gas Law
PV = n R T
V = n R T / P n = moles R = gas constant = .082057 L atm / ( K mol)
T is in Kelvin
V = .25 moles * .082057 * (273.15 + 57) K / .82 atm = 8.3 moles
( two Sig Dig)
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